1) What causes surface tension? a) A. Cohesive forces between molecules b) B. Adhesive forces only c) C. Gravity acting on liquid d) D. Evaporation of liquid 2) Which factor most affects surface tension? a) A. Temperature b) B. Shape of container c) C. Color of liquid d) D. Volume of liquid 3) Which is the best example of surface tension? a) A. Floating paper clip b) B. Ice melting c) C. Salt dissolving in water d) D. Water boiling 4) Compute the surface tension if a force of 0.1 N acts along a length of 1 cm. a) A. 1 N/m b) B. 10 N/m c) C. 0.01 N/m d) D. 100 N/m 5) A liquid has a dragging force of 7 N acting along 2 m. What is its surface tension? a) A. 3.5 N/m b) B. 14 N/m c) C. 0.35 N/m d) D. 7 N/m 6) What is the correct formula for surface tension? a) A. T = F × d b) B. T = F / d c) C. T = d / F d) D. T = F² / d 7) Which substance reduces surface tension most effectively? a) A. Soap b) B. Salt c) C. Sugar d) D. Sand 8) An insect of 1.5 cm length rests on water with surface tension 5 N/m. Compute its approximate mass. a) A. 7.6 g b) B. 0.76 g c) C. 76 g d) D. 0.0076 kg 9) Why do water drops form spherical shapes? a) A. Surface tension forms spheres b) B. Gravity prevents perfect spheres c) C. Adhesion only causes shape d) D. Evaporation makes them round 10) Which application involves surface tension? a) A. Medical hand scrubbing with soap b) B. Floating icebergs c) C. Oil drilling d) D. Evaporation of water 11) What is viscosity? a) A. Fluid’s resistance to flow b) B. Its ability to evaporate c) C. Its boiling point d) D. Its density 12) Which liquid has the highest viscosity? a) A. Water b) B. Molasses c) C. Alcohol d) D. Vinegar 13) Which liquid has the lowest viscosity? a) A. Vinegar b) B. Honey c) C. Ketchup d) D. Oil 14) Which factor most affects viscosity? a) A. Temperature b) B. Color c) C. Shape of container d) D. Volume 15) What happens to viscosity of liquids when temperature increases? a) A. It decreases b) B. It increases c) C. It stays the same d) D. It doubles 16) Which is an example of a high-viscosity fluid? a) A. Honey b) B. Water c) C. Alcohol d) D. Vinegar 17) Which is an example of a low-viscosity fluid? a) A. Alcohol b) B. Honey c) C. Ketchup d) D. Peanut butter 18) Which statement about PMOM is correct? a) A. Liquid particles slide and roll over each other b) B. Solid particles move freely c) C. Gas particles are fixed d) D. Heat makes particles stop moving 19) Which observation demonstrates viscosity? a) A. Honey flows slowly compared to water b) B. Alcohol evaporates quickly c) C. Ice melts in water d) D. Salt dissolves in water

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